Preface; Acknowledgments; 1. Newton's third law: forces belong to interactions; 2. Freebody diagrams: representing forces; 3. Newton's first law: permission to use Newton's second law; 4. Introducing Newton's second law; 5. Newton's second law with zero acceleration; 6. Describing changing motion: acceleration; 7. Newton's second law with changing motion; 8. What comes next; References; Index.